Summary statistics for demo2009q4 dataset : by Jean Roth , jroth@nber.org , 18 Dec 2015 Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- primaryid | 137708 6453657 41212.87 6253237 6710716 caseid | 137708 7136985 179214.4 3015155 7396028 i_f_code | 0 i_f_code_num | 137708 71.35369 .9353659 70 72 foll_seq | 0 -------------+-------------------------------------------------------- image | 0 event_dt | 92891 2.01e+07 63624.78 2090503 2.01e+07 event_dt_num | 92890 17731.47 893.2726 -21549 18261 mfr_dt | 130158 2.01e+07 53274.05 901102 2.01e+07 mfr_dt_num | 130158 18170.8 7089.439 10608 2575370 -------------+-------------------------------------------------------- fda_dt | 137708 2.01e+07 82.73183 2.01e+07 2.01e+07 fda_dt_num | 137708 18219.2 25.89681 18079 18262 rept_cod | 0 rept_cod_num | 137708 729337.4 49394.47 687382 806982 mfr_num | 0 -------------+-------------------------------------------------------- mfr_sndr | 0 age | 101193 175.7721 1651.175 -7 35471 age_cod | 0 sex | 0 e_sub | 0 -------------+-------------------------------------------------------- wt | 38962 83.86513 48.56769 0 2029 wt_cod | 0 rept_dt | 137432 2.01e+07 2763.243 1.91e+07 2.01e+07 rept_dt_num | 137432 18215.39 105.4767 -18323 18266 occp_cod | 0 -------------+-------------------------------------------------------- death_dt | 13047 2.01e+07 20016.45 1.96e+07 2.02e+07 to_mfr | 0 confid | 0 reporter_c~y | 0 occp_cod_num | 122077 7450.471 533.7003 6778 8072 by Jean Roth , jroth@nber.org , 18 Dec 2015